Manufacturing expiration dating policy
[UPDATE: Verallia plants, as of April 2014, are now under the ARDAGH GROUP].
The rights to the “Kerr” brand name, as used on currently-made fruit jars, was held by the Alltrista Corporation, which later became known as the Jarden Corporation (Jarden Home Brands).
Kerr is most well known as producers of several kinds of fruit jars used for home canning.
(They also produced large quantities of other types of glass containers, especially in later years).
For example, pasteurized milk can remain fresh for five days after its sell-by date if it is refrigerated properly.
However, improper storage of milk may result in bacterial contamination or spoilage before the expiration date.
Bacterial contaminants are ubiquitous, and foods left unused too long will often be contaminated by substantial amounts of bacterial colonies and become dangerous to eat, leading to food poisoning.
Some companies use induction sealing and vacuum/oxygen-barrier pouches to assist in the extension of the shelf life of their products where oxygen causes the loss.One major exception is the Shelf Life Extension Program (SLEP) of the U. Department of Defense (Do D), which commissioned a major study of drug efficacy from the FDA starting in the mid-1980s. The SLEP and FDA signed a memorandum that scientific data could not be shared with the public, public health departments, other government agencies, and drug manufacturers.The SLEP discovered that drugs such as Cipro remained effective nine years after their shelf life, and, as a cost-saving measure, the US military routinely uses a wide range of SLEP tested products past their official shelf life if drugs have been stored properly.Shelf life depends on the degradation mechanism of the specific product.Most can be influenced by several factors: exposure to light, heat, moisture, transmission of gases, mechanical stresses, and contamination by things such as micro-organisms.
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Kerr did not actually manufacture glass during the earliest period from 1904 to 1909, but instead had jars made for them (with the Kerr name embossing) by other glass companies, Illinois-Pacific Glass Company of San Francisco, and Hazel-Atlas Glass Company based in Washington, PA, later Wheeling WV.